1. Baden, S. P., L. O. Loo, L. Pihl & R. Rosenberg, 1990. Effects of eutrophication on benthic communities including fish: Swedish west coast. Ambio 19: 113?122.
2. Bokn, T.,1979. Use of benthic algae classes as indicators for eutrophication in estuarine and marine waters. In H. Hytteborn (ed.) The use of ecological variables in environmental monitoring. Naturv�rdsverket, report 1151.
3. Bokn, T., 1984. Basisunders�kelser i Hvaleromr�det og Singlefjorden. Gruntvannsorganismer 1980?1982. Statlig program for forurensningsoverv�king. Report 135/84. NIVA-report. Serial No. 1615,49 pp.
4. Bokn, T., 1990. Effects of acid wastes from titanium dioxide production on biomass and species richness of benthic algae. Hydrobiologia/Dev. Hydrobiol. 204/205: 197?203.
5. Bokn, T., J. Knutzen & B. Rygg, 1976. Influence of freshwater, industrial waste and domestic sewage on bottom fauna and benthic algae in the Hvaler Archipelago (S.E. Norway). In S. Skreslet et al. (eds) Fresh Water on the Sea: 211?220. The Association of Norwegian Oceanographers, Oslo, 246 pp.